# Digital Circuits Questions and Answers – Introduction of Memory Devices – 4

This set of Advanced Digital Electronic/Circuits Questions & Answers focuses on “Introduction of Memory Devices-4”.

1. Dynamic memory cells use _______________ as the storage device.
a) The reactance of a transistor
b) The impedance of a transistor
c) The capacitance of a transistor
d) The inductance of a transistor

Explanation: Capacitance of a transistor prevents from loss of information in a dynamic memory cell.

2. To store 1-bit of information, how many transistor is/are used ____________
a) 1
b) 2
c) 3
d) 4

Explanation: Only one bit transistor is needed to store 1-bit of information.

3. Static memory holds data as long as __________
a) AC power is applied
b) DC power is applied
c) Capacitor is fully charged
d) High Conductivity

Explanation: In any semiconductor equipment, AC power can’t be supplied directly. So, static memory holds the data as long as DC power is applied.

4. The example of dynamic memory is __________
a) CCD
b) Semiconductor dynamic RAM
c) Both CCD and semiconductor dynamic RAM
d) Floppy-Disk

Explanation: The examples of dynamic memories are CCD and semiconductor dynamic RAM because of the contents of both the memories changes with time.

5. In dynamic memory, CCD stands for __________
a) Charged Count Devices
b) Change Coupled Devices
c) Charge Coupled Devices
d) Charged Compact Disk

Explanation: In dynamic memory, CCD stands for Charge Coupled Devices.

6. Volatile memory refers to __________
a) The memory whose loosed data is achieved again when power to the memory circuit is removed
b) The memory which looses data when power to the memory circuit is removed
c) The memory which looses data when power to the memory circuit is applied
d) The memory whose loosed data is achieved again when power to the memory circuit is applied

Explanation: Volatile means ‘liable to change rapidly’ and volatile memory refers to the memory which looses data rapidly when power to the memory circuit is removed. Thus, it looks after it’s data as long as it is powered. Non-volatile means ‘not volatile’ and non-volatile memory refers to the memory which retains the data even if there is a break in the power supply.

7. Non-volatile memory refers to __________
a) The memory whose loosed data is retained again when power to the memory circuit is removed/applied
b) The memory which looses data when power to the memory circuit is removed
c) The memory which looses data when power to the memory circuit is applied
d) The memory whose loosed data is achieved again when power to the memory circuit is applied

Explanation: Volatile means ‘liable to change rapidly’ and volatile memory refers to the memory which looses data rapidly when power to the memory circuit is removed. Thus, it looks after it’s data as long as it is powered. Non-volatile means ‘not volatile’ and non-volatile memory refers to the memory which retains the data even if there is a break in the power supply.

8. The example of non-volatile memory device is __________
a) Magnetic Core Memory
c) Random Access Memory
d) Both Magnetic Core Memory and Read Only Memory

Explanation: Non-volatile means ‘not volatile’ and non-volatile memory refers to the memory which retains the data even if there is a break in the power supply. The examples of non-volatile memory devices are Magnetic Core Memory & ROM because both have capability to retain the data.

9. Based on material used for construction, memory devices are classifieds into ________ categories.
a) 2
b) 3
c) 4
d) 5

Explanation: Based on material used for construction, memory devices are classifieds into two categories, viz., Magnetic and Semiconductor memory. Magnetic recording is the process of storing data magnetically. Hard disk, floppy disk, magnetic tape are examples of magnetic recording process.

10. Magnetic recording is the process of __________
a) Storing data symmetrically
b) Storing data sequentially
c) Storing data magnetically
d) Both storing data symmetrically and

Explanation: Based on material used for construction, memory devices are classifieds into two categories, viz., Magnetic and Semiconductor memory. Magnetic recording is the process of storing data magnetically. Hard disk, floppy disk, magnetic tape are examples of the magnetic recording process.

11. Magnetic drum is a storage medium using __________
a) The surface of a jumping magnetic drum
b) The surface of a rotating magnetic drum
c) The surface of a stopped magnetic drum
d) The surface of a moving magnetic drum

Explanation: Magnetic drum is a storage medium using the surface of a rotating magnetic drum which have tendency to hold the data.

12. Magnetic core is the digital memory in which data is stored magnetically in individual cores operated by __________
a) Up and down select wires
b) Row and column select wires
c) Serial and parallel select wires
d) Up and Serial select wires

Explanation: Magnetic core is the digital memory in which data is stored magnetically in individual cores operated by row and column select wires, with data obtained from sense wire.

13. By which technology, semiconductor memories are constructed?
a) PLD
b) LSI
c) VLSI
d) Both LSI and VLSI

Explanation: Generally, semiconductor memories are constructed using Large Scale Integration (LSI) or Very Large Scale Integration (VLSI) because these are made up of NMOS, CMOS, BJT, etc.

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